Turn off the flashlight on Android (milestone 2.1)

Source: Internet
Author: User

Different mobile phones use different methods to enable Flash. Here, the Motorola milestone mobile phone is used as an example main. xml:

[HTML]
View plaincopy
  1. <? XML version = "1.0" encoding = "UTF-8"?>
  2. <Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android"
  3. Android: layout_width = "fill_parent"
  4. Android: layout_height = "fill_parent"
  5. Android: Orientation = "vertical">
  6. <Button
  7. Android: Id = "@ + ID/Open"
  8. Android: layout_width = "fill_parent"
  9. Android: layout_height = "wrap_content"
  10. Android: text = "@ string/Open"/>
  11. <Button
  12. Android: Id = "@ + ID/Close"
  13. Android: layout_width = "fill_parent"
  14. Android: layout_height = "wrap_content"
  15. Android: text = "@ string/Close"/>
  16. </Linearlayout>

Activity Code:

[Java]
View plaincopy
  1. Package com. Android. Flashlight;
  2. Import Android. App. activity;
  3. Import Android. OS. Bundle;
  4. Import Android. View. view;
  5. Import Android. widget. Button;
  6. Public class androidflashlightactivity extends activity {
  7. /** Called when the activity is first created .*/
  8. Private button mbtnopen, mbtnclose;
  9. Private myflashlight;
  10. @ Override
  11. Public void oncreate (bundle savedinstancestate ){
  12. Super. oncreate (savedinstancestate );
  13. Setcontentview (R. layout. Main );
  14. Mbtnopen = (button) findviewbyid (R. Id. Open );
  15. Mbtnclose = (button) findviewbyid (R. Id. Close );
  16. Try {
  17. Myflashlight = new myflashlight ();
  18. } Catch (exception e ){
  19. E. printstacktrace ();
  20. }
  21. Mbtnopen. setonclicklistener (New button. onclicklistener (){
  22. @ Override
  23. Public void onclick (view v ){
  24. If (myflashlight. isenabled () = false ){
  25. Myflashlight. Enable (true );
  26. }
  27. }
  28. });
  29. Mbtnclose. setonclicklistener (New button. onclicklistener (){
  30. @ Override
  31. Public void onclick (view v ){
  32. If (myflashlight. isenabled () = true ){
  33. Myflashlight. Enable (false );
  34. }
  35. }
  36. });
  37. }
  38. }

Encapsulation Method:

[Java]
View plaincopy
  1. Package com. Android. Flashlight;
  2. Import java. Lang. Reflect. method;
  3. Import Android. OS. ibinder;
  4. Public class myflashlight {
  5. Private object SVC = NULL;
  6. Private method getflashlightenabled = NULL;
  7. Private method setflashlightenabled = NULL;
  8. @ Suppresswarnings ("unchecked ")
  9. Public myflashlight () throws exception {
  10. Try {
  11. // Call servicemanager. getservice ("hardware") to get an ibinder for the service.
  12. // This appears to be totally uninitialized ented and not exposed in the SDK whatsoever.
  13. Class Sm = Class. forname ("android. OS. servicemanager ");
  14. Object hwbinder = Sm. getmethod ("getservice", String. Class). Invoke (null, "hardware ");
  15. // Get the hardware service stub. This seems to just get us one step closer to the proxy
  16. Class hwsstub = Class. forname ("android. OS. ihardwareservice $ stub ");
  17. Method asinterface = hwsstub. getmethod ("asinterface", Android. OS. ibinder. Class );
  18. SVC = asinterface. Invoke (null, (ibinder) hwbinder );
  19. // Grab the class (Android. OS. ihardwareservice $ stub $ proxy) so we can reflect on its methods
  20. Class proxy = SVC. getclass ();
  21. // Save Methods
  22. Getflashlightenabled = proxy. getmethod ("getflashlightenabled ");
  23. Setflashlightenabled = proxy. getmethod ("setflashlightenabled", Boolean. Class );
  24. }
  25. Catch (exception e ){
  26. Throw new exception ("led cocould not be initialized ");
  27. }
  28. }
  29. Public Boolean isenabled (){
  30. Try {
  31. Return getflashlightenabled. Invoke (SVC). Equals (true );
  32. }
  33. Catch (exception e ){
  34. Return false;
  35. }
  36. }
  37. Public void enable (Boolean TF ){
  38. Try {
  39. Setflashlightenabled. Invoke (SVC, TF );
  40. }
  41. Catch (exception e ){}
  42. }
  43. }

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